There are a couple of them for sale on Ebay now and they come up from time to time. I rebuilt mine myself last winter and had never undertaken one before but like chevman32 said, they are pretty easy to do. I bought NOS or NORS parts off Ebay and the bearings and gasket kits from the repop sellers and everything worked fine. wdoftexas, a contributor on this site usually has a nice supply of all the internal gears, countershafts, etc that you might need if you want to undertake it yourself. Those parts also come up on Ebay as well. I took a bunch of pics when I did my rebuild and posted them on the "Tranny Rebuild" album on the webshots link below. You also need a good repair manual. Some of the smaller reprinted ones for sale through the repops have dark, lousy pictures but a good reprinted or original factory truck manual should provide you enough guidance. You'll need some basic tools as well and can sometimes makeup replacements for the old factory tools that they show in the manual pics. I plan on rebuilding another one this winter from my donor trannys and have it as a spare. Good luck!